Vulcan-Hart GRS25 Service Manual page 11

SERVICE MODE
Enter the service mode by pressing the product 3 and product 4 keys while turning "on" power to the fryer
computer. Display should now read "SERVICE". In this mode the following display/systems response will be
given for the noted error condition.
SYSTEMS PROBLEM
OR FAILURE
Ignition
Low temperature (lack
of heat)
High temperature
(1st limit)
High temperature
(2nd limit)
Probe
Self check
Self check
SYSTEMS TEST
This menu is intended to give the servicer the ability to check the basic parts of the computer interface (i.e. the
display panel and keypad). Enter the system test mode by holding down the product 8 and 9 keys while turning
on the power for the computer. Upon entry to the system tests the message panel will read "SYSTEM TESTS".
Use up and down arrow keys to choose the following.
Pressing "EXIT" while in the "SYSTEM TESTS" menu will exist the system test mode and return the computer
to the "NORMAL" operating mode.
SOFTWARE VERSION
The display message "VERXXX" tells the version of the software that is installed into the computer. XXX
is a code representing the software revision level. The last two digits represent minor revision sand first
digits represent major revisions. For example version 1.02 would appear as 'VER 102".
DISPLAY TEST
This allows the servicer to test the display characters. Upon entering this test a string of characters will
appear on the display panel. The servicer then uses the up and down arrow keys to scroll through the
following sets of characters:
Press "EXIT" at any time to terminate the display test mode.
KEYPAD TEST
This allows the servicer to test for proper key functioning. Entering this test will cause the
computer to display "PRESS KEYS". After this display press each key on the keypad. When the
key is pressed the message display should match the depressed key. Pressing "EXIT" at any
time will terminate the keypad test and return the computer to the "SYSTEMS TEST" menu.
DISPLAY
IGN FAILURE with
L or R for split
LO TEMP XXXF
HI TEMP XXXF
HI TEMP XXXF
PROBE OPEN R or L
PROBE SH R or L
MICRO FAIL
MICRO FAIL
-VER XXX
-DISPLAY TEST
-KEYPAD TEST
"0123456789 @"
"ABCDEFGHIJKL"
"MNOPQRSTUVWX"
"YZ<-> * / & ? + ( )"
11
SYSTEMS RESPONSE
Heat off
Heat off
Heat off
Hardware limit, heat off
Heat off
System to backup mode
System to back up mode